Kazuki ATSUTA

Making of Pyroclastic Flow Hazard Map of Miyakejima

Tokuzou HOSOYAMADA

There are as much as 108 active volcanoes including the uninhabited islands and the submarine volcano in Japan. When some of these volcanoes become more active, eruption could follow. The eruption is consisting of Pyroclastic Flow, Lava Flow and Volcanic Mud Flow. Pyroclastic flow specially has been regarded as considerable phenomena since Unzen-Fugendake Eruption in 1991 caused a big pyroclastic flow. The Miyakejima Eruption also caused pyroclastic flow again in 2000.

To make a prevention pyroclastic flow disaster, fully understanding of the flow and estimation of the downstream range which is sometimes referred to as Hazard map, are inevitable. Aim of this study is to make a volcanic Hazard map of Miyakejima by numerical simulation of pyroclastic flows.